Make sure to open the "script console" by choosing from the Help menu -> Logs -> Other Logs.Then run this line by pressing ">" on your keyboard, pasting the following and pressing <enter>. Post the results.

I guess there are no files directly below the folder "Pool" or something's wrong with the SelectEx addin preparation/installation. ITEMCOUNT is something we can tackle later, I currently don't know if it's required when used in conjunction with MAXSIZETOTAL, it seems it should work without, not sure though.

Updated to v0.5.3:v0.5.2 - 1o/2o15- fix for inaccessable folders- new switch "NOFAIL" to prevent button from aborting in error situations (no items selected when trying to store selection e.g.)- new option CLEARVAR to remove stored selections in variables (supports multiple variables, separated by ";")- applying an empty selection container will give info message instead of error, but still fails the execution (override by NOFAIL if undesired)

v0.5.3 - o2/2o16 & o5/2o16- fix for FROMFILE creating nonexisting files- fix for TOFILE not creating nonexisting files- whenever a filter is set, a tab-scoped variable "Script.SelectEx.FilterEnabled" and "Script.SelectEx.FilterEnabled.bfc.drop" is created. The former allows a button to indicate a currently set filter in a folder by icon. The latter var is meant for use with the AutoVars addin (viewtopic.php?f=35&t=24636), which will clear both vars and reset the indicator button automatically if it's installed.

Updated to v0.5.4:- fix for incorrect output informing about less selected files than expected- new option "ENCODING" to specify encoding of created files (unicode,ascii,default)- new option "EOL" to specify end of line characters (use "\r" for CR and "\n" for LF or any other text)- default eol for file and clipboard content will be "\r\n" from now on, if EOL option is not given- TOFILE and FROMFILE now automatically resolve DO aliases, libs and various other non standard paths- use of native url script property

Yes, this is because of the unfortunate magic built into some of the native commands and the regular button engine.

If your button does not seem to make use of Select and there are no items currently selected, the Delete command will refuse to do it's job. It's the same for some other native commands iirc. To get around this, you need to add a dummy command at the top. This command will fool DO (or the Delete command) into thinking there are files selected and it will get to work eventually after SelectEx finished its selection. It's weird, I needed to try and was only lucky to remember this oddity, but that's how it is. o)